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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c83d914a7b72ebc9f51aae4f3489a93167bb5fffa465364f3990cf74e2c8aec' 
  AND token = 'Z8fv1yaYdJD2H2eaR5LUXO/emjHvNt9KZGY/5s+ypto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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