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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc2a5fc365a41fd46d736a126e41c89bbe56e3044f8a864160342dbf7165373' 
  AND token = 'cXr2qkqeqN3RqgXH5AzmjygUc9i2MPef2bgYe9qu7fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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