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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadcde4bc6ba08ebc98a8a8e1c8ea33ebff3255bef371c47f555ee453a15c240' 
  AND token = 'aoZPjcqzztasp/hTre9w4kDjJnhBYTQ/EmvzOF/cmWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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