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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bdb897e455bf849ceadfea3492f096c71b02d3e806bac30b62725797cc9977' 
  AND token = 'ReLnlrAoENWk1pcDZXRxMsEKdV5N5crPkXe7GOaqpnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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