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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51920d7ddbc69e1e5adeed4ec9327f4db0095a7252296a0af9c78a3515f6ae4b' 
  AND token = 'QjV3dzyd3pXFI/KZuZCCObfg7GF7WEVK7g9cC3iDBsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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