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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa69307c85c29e370f5f35f792b93fd70bd7349a0ed3d7c8cbbcdbe8d7cff1c' 
  AND token = '7i14m4FvEkshcnBfIgGU5jXKHPChxd9IAg7RZFNhIog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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