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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5217083e95d1bb5f49a188cfc759c83b5e284ed6acf0206de0d86b2e514700' 
  AND token = 'YvBpbmEpZxJmGpWUrG0avbs1Hvxj76+sHMIISm5hAxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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