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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68c0d42cfb23af25462cafd9b08bc307aecd5b3d4b7117eea90449c98f65753' 
  AND token = 'GWzahTYDIK9KC5+eIdf3ONuz4/B9WoOoaI8rJis7wQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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