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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bcbb83fd0e9b7f5fdb3614f7393433099e9579eecbf6152a8b521f3b14c2ca' 
  AND token = '6I1oI/uGwYSUv1IdqhJYktDm9c2aNS9wTbc4Xr9HzoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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