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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7dea9200cd63b147e9b2dea0fd10824ef17f4b1e09e2ece3dc83a44ffa4ad0f' 
  AND token = '0WMv9+ZHQicLcaM7Cf2ZFsD/2+hkeqJQpWQOtbACRR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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