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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5f390c34410a1f6b6c6c15208bf6dcc20984527902469f59b51eec31f5f3ee' 
  AND token = 'cmTo5GlIzse3NnI56sqieSslN4Zs8Etidxb3/ttau0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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