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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b945262f847b98cca784ad2c802acecee4cdcc2d21edac641057d83f551a99' 
  AND token = 'dbVedQ9TSd1itVRHmRHb63x6a4ZIl/SCC30c8zgGO/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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