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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f798ec2724c85f7c45768e93366ca669e9c9e8e3f89f3acd0befce0cff5858' 
  AND token = 'huji9UUDeaOVgWVjm0JE5/+qLakZ+haQrjhjU+ZxH+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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