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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ab4c4797a992ee43a764b9bbf16506804d19240b3c94b8fff83eba27d1628d' 
  AND token = 'Jt8totnmYtd8C7OzS09KvK5k7ecMnPacb0Lftvcblpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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