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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbdc9b4e0baf9d11a1c0ee8e6f82a51657535dab2068adf59300d513d354d84' 
  AND token = 'UC1wdmvX0dyAuQdIeoOK6f2rZXM/3ZghNUoWZxZpuVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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