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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287df70415a18b49982eca6d2c0111811fa10205713aa12ec0634faeb822ac8b' 
  AND token = 'pqGjpJJP2z4ySdfolTBkWoX857E9N+276Xc9DhQkGNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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