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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9389c401f7be02a1773ea5c49f2a3545517e6002bbf3654670213757569c2c3e' 
  AND token = '4pVyheAACUvX8azmwTdITu1UHnDyrzZ9eP4i/+1NytA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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