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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c4ac33af5643ae6e3778d02b71e46264a88854d204766ee599401e38f696b6' 
  AND token = 'w1zjGJxPoD8NB7CgQ/TI6bn85Wrc9gsJzyvVaq3e0oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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