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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28044144b61087fe9038348bc61c81b487cce64389b328f10bfc3e7b6e448e6b' 
  AND token = 'Nm20HY8+QYPsTBBIv6cbzw3LLM4aohe/TUnheI4RwvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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