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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb98d498cb2ccde2d9d3fae6b57e36e7f21474a1e2936e96d11d35759fc93de' 
  AND token = 'dfdChb7htxhImz6YGYFt4xGe1g6zwiVXSDf7g/L34d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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