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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686325f2e0033ab3ee35404f8753e9ec7f324e9ebd7e6e95bcfb131fab8ab8ed' 
  AND token = 'Z8ojWDei7X7ui5oR0JUUHJbZ5pLeyLFdIaL0RMUmtlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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