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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac4b877f484965eaba11b1cabcefa21fb6315dbb334700a475a270a2c5616c2' 
  AND token = 'd7Uwkck9VJoQYyKEhh6XDj0/hjOyD6OAdp0bIAK8xz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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