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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd719fface844b37c5ea186599da695f1b1aed830ae18a49022056de88c68d15' 
  AND token = 'muZp2EcD07VweF3qb4G2I81X6K7/NfDIXZXfhYR8oeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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