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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f704a2d6155528686cf17ba1870702a365b365d972bf63a96268d315a03c88a' 
  AND token = 'lS7FwxrFU8QzFpxHeGrECb+fH9cummutbYY9T4rQor0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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