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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247a7ae5c728be835e5cc647199d2faf77f09873e6ba756d0da5074f0688cd54' 
  AND token = 'stQGylAA7CF15NJEwqDKkxIIAq/ueDGaceIq3aPg8Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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