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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06245483a00a79f498ef7ba3df3062eef852eb0cee16f18a998fe52cebb4beaa' 
  AND token = '4zB3L2hEmzurAj1pl6G5RHCeAL2Du979tB1imitLpes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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