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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b081ebd38158621c86eac8d109c4810d7f1974999c8076ce8e3c880082a82da3' 
  AND token = 'gln6ylIRPSaBFaMwXlF4Z4OKTDF2z6YPVBNW1CKza88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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