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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c7f4112d7ad4ca4418a055466deefdfdeca5f0dc92aa49714498eeced78b8e' 
  AND token = 'R/fggdA4eCElwGnmFsVpW2bjN1AgEq64KZkraMyAw9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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