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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c95bd69df50c5d0654b4a9ac04f075692fa76ef1efd6d43b106ed5f601f2803' 
  AND token = 'wyjlpPEUE91IUvu6uTlK4CVhdzkj/9pduu9qMSqVsok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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