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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f2944564e313bd60e64f71812a4e3182b9889825cd4421db3af10c9aed23f5' 
  AND token = 'tJT2G4ObDSXvmUKItFh+72/ufTg0TqvhM3hnhRTJ5iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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