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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc4072667dc2528c07f2a9be043be791e96210bf534d67b5d5087f8da7267d9' 
  AND token = 'MmxobrJr5ZKcx5MCdrmAZqYqjPR3gIdJOtdrROU+PL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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