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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb02f713024c55333e2dafa38dfa32cd20e096903efd25c0ab645aebbe80a4b' 
  AND token = 'nu5Wos4KLz3FS1ZVbUuoKJE01JDqbWR7KdhKKTk3j4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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