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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dccf7c3577726825751314b6a29c904350e3a105c34d9f5cd1e7a9340221b3e' 
  AND token = 'TNg9xbHVnKGHnGW9bDyE71qlvkkkxjaXcs40HwvEgC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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