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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b984e293e552479f1f795829e8e6a10be32d2b8b96248642f74e59d10d490cdf' 
  AND token = 'bYIo6c6DYvKz2io6906MS8QrBobzpi2zxkwNQAi7SAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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