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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdf392cf45232db8a49e5c5194d3fe6a428a005ae31e13a0c796e950a631782' 
  AND token = '3R73PV6xyrru9uIhsxhfR2hct6V8aqWmktMbDS62W0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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