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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b021b9d3f82e112b1b9a6b73ba6a010f4bca1c860eaa2570bfe26ff104286f66' 
  AND token = 'DnkOajeHqTmCN7LbmabPYOriJFaq5u+Lu0llOzstoMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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