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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198ef5dcbf4f9a5d36500d98c1c977937bb950c4ebf3dcbd1464d08f96fb65eb' 
  AND token = '3Mr6Kwapiyhd7cauDx34Uq9oKU6QN4uvk+Pj+OCcxfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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