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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c99def6d8c6b97563b8550dbea7ec8412373b59d97cb2285360b9db1453d94f' 
  AND token = 'M3cGFNMMzGxqvTxiZBGwb4VHhd10ZFWw2fIVDMEack8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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