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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a490ac70eddf5e49928a69c56f1e1b6891c1e587dfebba2538918fec6531e7' 
  AND token = '/z++Duq7ruIMwCJc6BZt+DVtXxJUoS//j2ouP88+1Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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