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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac408a5cd8d5bef39eead96466d420e26cd3319aced12b9d390e387ab8ad743' 
  AND token = 'mq5fSKhgui7PMC6mmNpm0gD0c2kQTPG0ti/6o4dbC7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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