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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c859abe0e10bdb804e102e4f6bb83cf6e3ed1b17e5921536d0e6f57c29161f87' 
  AND token = 'H4F5Suhr0qyx16lob97Q3G3XFfZZYvR0qE59EYKizjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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