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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3139c63e60a5cfd39a7169f97e662c391a61bac35bd163ff95e77a5f25d97f6f' 
  AND token = 'Rn6urMDLeZUo0c6WEXp3bJr67eOdllD875lJEhhPyhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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