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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3753ce0831816308163c58b85a1a8eeed2e993d2470eed3ea61619aa617ec2' 
  AND token = 'zTrfTRj+J5XepKF/eBKtHZ6fYxw71Tosc/5GJG/qav0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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