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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c162f24d8a896a6eecfa1e7e03bbf88b2cf826f6a355f6d17dfb9d5b32b9b409' 
  AND token = 'fvRbXQ3WmGUaYCZi0QEto4exNVhI9gLRwlJF2OhAEOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}