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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a79fcd93783d73d4b135a34aa56cbf695b70e74e339c543738ec00c81b3d14' 
  AND token = 'O7N4VQEKw5mdl5qzuC3dwWD3sdW51a+8lUlG79wMgX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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