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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3256b12338d2d230f49b51f30646b86c014fe79b5c579613b139c04504ce90bc' 
  AND token = 'WLO05njjCNOqjXBdl2EecYEDi3Svq3pm9gbvOUr9irc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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