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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f15f71480b3f98a7bf7f40a09197d0d49470cd3d35adfaa6fba2e3226f230e7' 
  AND token = '9ErC+bvhN0rFf7yvCAMKuVtE/vqEiN9rGpRtuKHdUWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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