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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f87710c3cf04da5bee227c346fd1bc321be5c7d59507b64b2f859ae548b8b1d' 
  AND token = 'wdzMRDSFY9gDnZneuQHSPoHkjfTbYiZalbGNjwk0Z6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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