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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32db3586a34e8004ff8a2dc29dc797ea2ca60be4a5b4ff316cc30b4374029e2' 
  AND token = '77523BCEq2+KGIt3EreXWuPg+nOvNDFLQrjLsg6uy5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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