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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11afcd6b1d0ea7b40fb8a68cfc138d54968f442308948a2f8af3b3c95e4277fa' 
  AND token = 'duJamFPyaMZf2Vc+BnZVhhdtaL55PFg+fHVSleukiy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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