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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cad084d7888c35e00cf9d829b77b4e173ee1a0f79009626248702bdd8e5dcb' 
  AND token = '5tWgjiNPBwEGINyJyLqX6Ejtlx+xJzcUsNd71Et9rG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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