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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a95de5e6c85c3554b713132daa43e0b30f43079fe609128e6448382a7823eb' 
  AND token = '+5XMNN16ZkHTO+LMIfbOYLCFrhL4qdY1jPR8nEnHy/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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